The boy lost his key so he has no choice but till his mother came homeA. waitedB. waitin

问题补充：

The boy lost his key, so he has no choice but till his mother came home．

A. waited

B. waiting

C. wait

D. to wait

答案：

A. waited

B. waiting

C. wait

(答案→)D. to wait

解析：本题考查非谓语动词。have no choice but to do除了……别无选择，固定短语，故选D。